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jewelry

Understanding Chameleon Diamonds

Question: Recently, someone offered me a chameleon diamond that changed shades from yellow/green to yellow. She tried to convince me that it was…
Color Grading White Diamonds

Step 4: Gem Grading Lesson 13 Back to syllabus “White,” 14kt white gold ring set with one 1.05-ct diamond and 6 10-pt diamonds, by Mark Somma.…
Clarity Grading Diamonds

Step 4: Gem Grading Lesson 12 Back to syllabus When clarity grading a diamond, gemologists examine anything that interferes with the free passage…
Diamond Cut Grading, Part 1

Of the Four Cs of gem grading, cut ranks as the most important for diamonds. The cut (or make) determines why one diamond features spectacular fountains…

Understanding Gemstone Facets

Step 1: Introduction to Gemology Lesson 22 Back to syllabus Facets, those “geometrically arranged, flat surfaces” that cover faceted gemstones,…
Carats and Gemstone Grading

Step 4: Gem Grading Lesson 2 Back to syllabus A carat is the standard unit of measurement for weighing gems, and it’s one of the Four Cs of gemstone…
Grading Set Stones

Step 4: Gem Grading Lesson 4 Back to syllabus Few gemologists deal strictly with loose stones. Occasionally, most may have to grade set gemstones.…